FDC37C665IR SMSC Corporation, FDC37C665IR Datasheet - Page 7

• Manufacturer Part Number: FDC37C665IR
• Description: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
• Manufacturer: SMSC Corporation

PIN NO.
4,3
2,5
10
11
17
97
96
9
7
8
nWrite
Gate
nWrite
Data
nHead
Select
Direction
Control
nStep Pulse
Disk Change
nDrive Select
O,1
nDrive Select 3
I/O Address 10
nMotor On 0,1
Motor On 2
NAME
DESCRIPTION OF PIN FUNCTIONS
nWGATE
nWDATA
nHDSEL
nDIR
nSTEP
nDSKCHG
nDS0,1
nDS3
A10
nMTR0,1
nMTR2
nPDACK
SYMBOL
BUFFER
TYPE
OD20
OD20
OD20
OD20
OD20
OD20
OD20
OD20
0D20
IS
I
I
7
This active low high current driver allows
current to flow through the write head. It
becomes active just prior to writing to the
diskette.
This active low high current driver provides
the encoded data to the disk drive. Each
falling edge causes a flux transition on the
media.
This high current output selects the floppy
disk side for reading or writing. A logic "1"
on this pin means side 0 will be accessed,
while a logic "0" means side 1 will be ac-
cessed.
This
determines the direction of the head
movement. A logic "1" on this pin means
outward motion, while a logic "0" means
inward motion.
This active low high current driver issues a
low pulse for each track-to-track movement
of the head.
This input senses that the drive door is open
or that the diskette has possibly been
changed since the last drive selection. This
input is inverted and read via bit 7 of I/O
address 3F7H.
Active low open drain outputs select drives
0-1. Refer to Note 2.
In non-ECP mode: Active low open drain
output selects drive 3. Refer to Note 2.
In ECP Mode, this pin is the A10 address
input.
These active low open drain outputs select
motor drives 0-1. Refer to Note 1.
Motor On 2: Refer to Note 1.
In ECP Mode, MTR2 is the Parallel Port
DMA Acknowledge input. Active Low.
high
current
DESCRIPTION
low
active
output